Photon dosimeters are used for measuring radiation in applications such as environmental monitoring, emergency response and protection of workers to protect people from the harmful effects of ionising radiation. However, the recent update of the basic standard for photon reference radiation fields in radiation protection, ISO 4037, in conjunction with the new radiation protection quantities introduced in ICRU (International Commission on Radiation Units and Measurements) Report 95, have presented significant challenges to calibration laboratories and industry. The requirements for implementing the new standard results in high costs and manpower to establish laboratory reference radiation fields, especially in small emerging metrology institutes. Therefore, guidance and training material are needed as well as clear and tested protocols. This project will provide protocols and guidance to metrology institutes, standardisation bodies and regulators for a consistent and harmonised approach to radiation protection measurements and calibrations following ISO 4037. Proposals to update ISO 4037 and future needs for type testing and implementation of new quantities according to ICRU Report 95 will also be provided. This will lead to compatible procedures and therefore increase the confidence in radiation protection metrology and testing.